rename python classes for shapes and

implememnt __getstate__ and __setstate__ to enable pickling
issue #1948

src/Mod/Part/App/AppPart.cpp

@@ -156,6 +156,16 @@ void PartExport initPart()
     PyModule_AddObject(partModule, "OCCDimensionError",
             PartExceptionOCCDimensionError);
 
+    //rename the types properly to pickle and unpickle them
+    Part::TopoShapePy         ::Type.tp_name = "Part.Shape";
+    Part::TopoShapeVertexPy   ::Type.tp_name = "Part.Vertex";
+    Part::TopoShapeWirePy     ::Type.tp_name = "Part.Wire";
+    Part::TopoShapeEdgePy     ::Type.tp_name = "Part.Edge";
+    Part::TopoShapeSolidPy    ::Type.tp_name = "Part.Solid";
+    Part::TopoShapeFacePy     ::Type.tp_name = "Part.Face";
+    Part::TopoShapeCompoundPy ::Type.tp_name = "Part.Compound";
+    Part::TopoShapeCompSolidPy::Type.tp_name = "Part.CompSolid";
+    Part::TopoShapeShellPy    ::Type.tp_name = "Part.Shell";
     // Add Types to module
     Base::Interpreter().addType(&Part::TopoShapePy          ::Type,partModule,"Shape");
     Base::Interpreter().addType(&Part::TopoShapeVertexPy    ::Type,partModule,"Vertex");

src/Mod/Part/App/TopoShapePy.xml

@@ -18,6 +18,16 @@ Sub-elements such as vertices, edges or faces are accessible as:
 * Edge#, where # is in range(1, number of edges)
 * Face#, where # is in range(1, number of faces)</UserDocu>
     </Documentation>
+    <Methode Name="__getstate__" Const="true">
+      <Documentation>
+        <UserDocu>Serialize the content of this shape to a string in BREP format.</UserDocu>
+      </Documentation>
+    </Methode>
+    <Methode Name="__setstate__">
+      <Documentation>
+        <UserDocu>Deserialize the content of this shape from a string in BREP format.</UserDocu>
+      </Documentation>
+    </Methode>
     <Methode Name="read">
       <Documentation>
         <UserDocu>Read in an IGES, STEP or BREP file.</UserDocu>

src/Mod/Part/App/TopoShapePyImp.cpp

@@ -455,6 +455,21 @@ PyObject*  TopoShapePy::importBrepFromString(PyObject *args)
     Py_Return;
 }
 
+PyObject*  TopoShapePy::__getstate__(PyObject *args) {
+    return exportBrepToString(args);
+}
+
+
+PyObject*  TopoShapePy::__setstate__(PyObject *args) {
+    if (! getTopoShapePtr()) {
+        PyErr_SetString(Base::BaseExceptionFreeCADError,"no c++ object");
+        return 0;
+    }
+    else {
+        return importBrepFromString(args);
+    }
+}
+
 PyObject*  TopoShapePy::exportStl(PyObject *args)
 {
     double deflection = 0;